Other NXP ProductsのトピックRe: mipi camera driver

mipi camera driver

ludovicleau-mer — Fri, 22 May 2015 08:57:29 GMT

Hi freescale community.

I try to create a new mipi driver for a custom mipi camera.

some informations :

I use the sabrelite platform

the sensor not use i2c, all configuration are static in camera.

I use the ov5640 driver to create my driver.

I fix IPU=1 CSI=0 and VC=2

i set 4 lanes

First i fix the sensor clock to 999MHz or 198MHz for testing several frequence values.

and i change the reset function in mxc_mipi_csi2.c file :

I have found in this community the registry value :

by exemple 0x44 => 198MHz or 0x74 => 999MHz also i modify :

in mipi_csi2_reset() function the line :

mipi_csi2_write(info, value, MIPI_CSI2_PHY_TST_CTRL1); with value is 0x44 (is the defautl value in original code) or 0x74

i load driver and start gstreamer for testing :

the debug show :

// information from mipi_csi2_info

cfg clock rate: 27000000

dphy clock rate: 198000000

pixel clock rate: 396000000

mipi_reset() Now Using 4 lanes // i set 4 lane

mipi_csi2_reset_clock() clock = 0044 (hex) // here i force the dphy clock, this function replace the original mipi_csi2_reset() for changing dphy clock

mipi_reset() after reset clock

// after the reset i get the mipi info struct, (here there are no change when i use 0x74, dphy clock must be 999000000 MHz)

// Also i continue my test with only 198MHz. (0x44)

cfg clock rate: 27000000

dphy clock rate: 198000000

pixel clock rate: 396000000

// here i check the mipi_csi2_dphy_status

mipi_wait()

mipi_wait() 0 mipi csi2 dphy status 200

mipi_wait() 1 mipi csi2 dphy status 2f0

mipi_wait() 0 mipi csi2 err1 0

mipi_wait() 0 mipi csi2 err2 0

I need help for understand why my dphy status is 2F0 and there are 0 for CSI_ERR1 and CSI_ERR2 ?

Normally i will found dphy status = 0x300 or 0x330

thanks for your help.

Re: mipi camera driver

ludovicleau-mer — Sat, 23 May 2015 06:41:12 GMT

Hi community,

i have read in thread : Re: imx6q sabre AI board MIPI camera. that the GaoJianzhong said :

You must initialize the i.mx6’s MIPI module firstly,

And then turn on the camera to output the mipi signal.

Is it still true ? because the message is posted in 2013. It is a feature of mipi ?

For information i use the kernel boundary-imx_3.10.17_1.0.2_ga

In my case camera is autonomous and it is started before i load module.

Regards

Re: mipi camera driver

ludovicleau-mer — Mon, 01 Jun 2015 13:23:05 GMT

Ok for this probleme : "You must initialize the i.mx6’s MIPI module firstly," is true. After many change in my code i retriee the dphy stauts 3F0 or 300.

Re: mipi camera driver

dehuanxin — Thu, 16 Jun 2016 21:36:49 GMT

Hi, ludovic

What clock and data pin output do you configure the camera to output before you initialize mipi dphy?

Do you set the camera output (data and clock) to HI-Z, or 0 (0V), or 1(1.2V)?